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Series Three of Downton Abbey is composed of eight episodes in addition to a Christmas special. It spans through the year 1920, and ends in 1921. Series 3 premièred in the UK on ITV on the 16th September, 2012, and premièred in the US on PBS on the 6th January, 2013.

Lady Mary Crawley and Matthew finally marry. The growing unrest in Ireland will also affect the Crawley family, as Lady Sybil Branson returns with her political husband Tom, where she will deliver her first child; a daughter.